Improvement of hydrothermal stability of Pt/SAPO-11 catalyst in hydrodeoxygenation-isomerization-aromatization of vegetable oil

被引：81
作者：
Rabaev, Moshe [1 ]
Landau, Miron V. [1 ]
Vidruk-Nehemya, Roxana [1 ]
Goldbourt, Amir [2 ]
Herskowitz, Moti [1 ]
机构：
[1] Ben Gurion Univ Negev, Dept Chem Engn, Blechner Ctr Ind Catalysis & Proc Dev, IL-84105 Beer Sheva, Israel
[2] Tel Aviv Univ, Raymond & Beverly Sacker Fac Exact Sci, Sch Chem, Ramat Aviv, Israel
来源：
JOURNAL OF CATALYSIS | 2015年 / 332卷
基金：
以色列科学基金会;
关键词：
Pt/SAPO-11-Al2O3; catalysts; Soybean oil; Hydrotreating; Hydrothermal stability; SILICOALUMINOPHOSPHATE MOLECULAR-SIEVES; MODIFIED NANOCRYSTALLINE; SELECTIVE ISOMERIZATION; SI DISTRIBUTION; RAW CHEMICALS; RAPESEED OIL; SOYBEAN OIL; SAPO-11; HYDROISOMERIZATION; CONVERSION;
D O I：
10.1016/j.jcat.2015.10.005
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
SAPO-11 component of Pt/SAPO-11-Al2O3 catalysts displays relatively low hydrothermal stability in hydrotreating of vegetable oils that produces water during the process. Application of XRD, HRTEM, NH3 TPD, TPO, H-2 pulse chemisorptions and Si-29 MAS NMR revealed that the reason for hydrothermal deactivation of SAPO-11 is partially reversible desilication of its framework. This results in gradual loss of acidity and catalytic activity in isomerization of normal paraffins - products of oil deoxygenation. Addition of amine surfactant hexadecylamine to SAPO-11 crystallization gel at HDA/Al2O3 ratio of similar to 0.6 strongly increases the hydrothermal stability of SAPO-11. This translates in stable operation of Pt/SAPO-11-Al2O3 catalyst in hydrotreating of soybean oil yielding >99% deoxygenation and producing liquid organic product with cloud point < -35 degrees C containing 15 wt% monoaromatics. The stabilizing effect of HDA is a sequence of increasing the relative content of Si(nAl(4-n)Si) tetrahedra with n = 3-4 displaying higher resistance to hydrothermal desilication. (C) 2015 Elsevier Inc. All rights reserved.
引用
收藏
页码：164 / 176
页数：13
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